Early investigations show the unmanned drone that crashed into a South Korean border island on Monday is from North Korea.
The presidential office of Cheong Wa Dae presumes the unmanned vehicle to be from the North as it was found after North Korea fired scores of artillery shells in the waters south of the Northern Limit Line as part of a live-fire military drill.
South Korea's defense ministry is continuing its analysis of the drone and is devising contingency plans to shore up the country's air-defense.
Military and intelligence officials are known to have concluded that the drones were assembled and developed in North Korea for reconnaissance purposes and was flown in from the North.
The light-blue drone was found on Baengnyeong-do Island , just south of the disputed western sea border between the two Koreas.
The drone is 183 centimeters long, almost two-and-a-half meters wide and weighs around 12.7 kilograms.
There was also a small digital camera installed on its body.

"Drones can be used for reconnaissance missions with cameras attached. If the unmanned vehicle is loaded with explosives it can also be used to bomb targets."

U.S. experts analyzed several photos of the drone's wreckage that were published in South Korean media and said the drone appears to be well past its prime and could even be considered an 'antique.'
Military and intelligence authorities say the unmanned vehicle is known to be similar to another drone that was collected from Paju city in Gyeonggi-do province, south of the demilitarized zone, on March 24th.
South Korea's military and intelligence authorities are collaborating on the investigation.
Ji Myung-kil, Arirang News.